Apparatus for sinking concrete piles.



No. 890,765. PATENTED JUNE 16, 1908. P. B.,GILBRETH. APPARATUS POR SINKING CONCRETE PILES.

APPLICATION FILED MAY, 1905.

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fmeses: n Inventor.' @LW u. Y www @L'zmm UNITED sTATEs PATENT oEErcE.'

FRANK B. GILBRETIL F NEW YORK, N. Y., ASSIGNOR TO CORRUGATED CONCRETE PILE COMPANY OF AMERICA, OF NEW YORK, N. Y., A CORPORATION OF MINE.

.APPARATUS FR SINKING- CONCRETE PILES.

Specication of `Letters Patent. Application led May 6, 1905. Serial N0..259,044.

patented .rune-1c, 190s.

To all whom 'it may concern: l

Be it known that I, FRANK B. GILBEETH, a citizen of the United States, residing at New Y York, in the borough of Manhattan and 5 county and State of New York, have invented an Improvement in Apparatus for Sinking.

tion taken through the metal sinking shell in its lowermost position; Fig. 2 is a similar section showing the shell partiall withdrawn andthe excavation partially ed with concrete;Fig. 3 is an elevation of the shell partially vbroken away showing the excavating shoe attached thereto; Fig. 4 shows a modilcation of my invention; Figl. 5 shows aplan of the sinking shell. In lthe practice of my invention I preferably sink a suitably shaped holeof the'appropriate de th in somesuitable manner, as by the use o the metal shell a, this being forced down yinto the learth preferably with the assistanceI of a water jet. The latter maybe supplied under pressure from any suitable source (not shown) through `the flexible connection b to the vertical -water pipe c connected thereto and passing down through the interior of the shell to the hollow shoe d into `which it is threaded to permit of easy remval. The shoe is removably held u on the lower end of the shell and is-provide at its lower edge with a series of jet openings c through which water is forced from the water s ace d of the shoe during the sinking of the shell carrying the dis laced earth up through the interior of the s ell and out at the top rapidly sunk to the required depthwith the use oflittle or no assisting force other than the weight of the shell and its attached arts.

. When the shell has been sunkV to t e required depth into some such position as 1s In the drawing -Figurel is a vertical sec-` .is formed at some thereof. By this procedure the shell vcan be tion thereat.

shown in Fig. 1,- the water pipe c; is with# drawn therefrom and removed fromv the shell. The grout or fluid concrete is then introduced into the excavation through the casing, this being preferably accomplished by means of the concrete feeding pipefattached in a fixed position to the interior of the shell and carrying at its top the funnel g into which theconcrete may be poured by any suitable means. As the concrete is entered into the excavation the casing isl gradually withdrawn therefrom, the shoe d loosened by the withdrawal thereof, `dro ping tothe bottom of the excavation and tllfere remaining' as shown in Fig. 2.

It will be observed that the lower end of lthe feed pipef is held at a fixed distance above the lower end of the casing and, during the placing of the concrete into the excava-` tion, the casing is withdrawn at such a rate that the, 'space between the lower end of the concrete i e and the open end of the casing will be fil e with a body of concrete as shown in Fig.' 2, which will act as a seal between the discharge end of the concretepipe and the lower end of the shell, ermitting the concrete to 'com letely fill t ve excavation as the shell is with aw'n, while'preventing the entrance of water or earthy matter into the lower end of the shell and between the to of the nformed pile and the discharge end of the concrete pipe. By this process the Vformation of a solid pile with auniform surface is insured. The formation` of the pile roceeds as described and as indicated in Fig. 2 9o until the casing has been entirely withdrawn and the excavation completely filled with concrete.l

In4 the ldrawings I have shown the pile formed with an enlarged section at its lower end, thus ,giving a greatly increased stability 4 to the same Athe enlarged p/ortion acting not Aonly to give a greater area of bearing'surface,

but also to tie the structure of the pile moreflrmly to the earth, which for certain purposes may be a factorof considerable importance. This `enlarged section of the pile which portion of its length, and.l preferably at the bottom thereof, is produced by increasing the size of the` excava- '105 This may be accom lished in any suitable way, but may be e ected by A rolonging the water jet or increasing the orce thereof, after the casing has been' sunk,

to or near the position shown in Fig. 1, thus 

